array_chunk
<?php
/**
* Return alternatives defined by values of each parameters.
*
* Exemple :
*
* array_alternatives(array('foo','bar'), array('baz', 'qux'));
* array(
* array('foo', 'baz'),
* array('bar', 'baz'),
* array('foo', 'qux'),
* array('bar', 'qux'),
* );
*
* array_alternatives(array('a'), array('simple-minded'), array('solution'));
* array(
* array('a', 'simple-minded', 'solution')
* );
*
* array_alternatives(array('a'), array('red', 'blue'), array('car'));
* array(
* array('a', 'red', 'car'),
* array('a', 'blue', 'car'),
* );
*
* @param array $first_element
* @param array $second_element
* @return array
* @author Xavier Barbosa
*/
function array_alternatives(array $first_element, array $second_element)
{
$lists = func_get_args();
$total_lists = func_num_args();
for($i=0; $i<$total_lists; $i++)
{
$list =& $lists[$i];
if (is_array($list) === FALSE)
throw new Exception("Parameter $i is not an array.");
if (count($list) === 0)
throw new Exception("Parameter $i has no element.");
unset($list);
}
// Initialize our alternatives
$alternatives = array();
foreach($lists[0] as &$value)
{
array_push($alternatives, array($value));
unset($value);
}
unset($lists[0]);
// Process alternatives
for($i=1; $i<$total_lists; $i++)
{
$list =& $lists[$i];
$new_alternatives = array();
foreach($list as &$value)
{
foreach($alternatives as $_)
{
array_push($_, $value);
array_push($new_alternatives, $_);
}
}
// Rotate references, it's cheaper than copy array like `$alternatives = $new_alternatives;`
$alternatives =& $new_alternatives;
unset($new_alternatives, $list, $lists[$i]);
}
return $alternatives;
}
?>
array_combine
(PHP 5)
array_combine — 키를 위한 배열과 값을 위한 배열을 사용하여 배열을 생성
설명
array array_combine
( array $keys
, array $values
)
keys 배열에서의 값들을 키로 사용하고 values 배열에서의 값들을 해당 값들로 사용하여 array를 생성합니다.
반환값
결합된 array를 반환합니다. 각 배열의 원소 수가 일치하지 않거나 배열이 비어 있으면 FALSE를 반환합니다.
오류/예외
keys 와 values 가 비어있거나 원소 수가 일치하지 않으면 E_WARNING이 발생합니다.
예제
Example #1 간단한 array_combine() 예제
<?php
$a = array('green', 'red', 'yellow');
$b = array('avocado', 'apple', 'banana');
$c = array_combine($a, $b);
print_r($c);
?>
위 예제의 출력:
Array
(
[green] => avocado
[red] => apple
[yellow] => banana
)
참고
- array_merge() - 하나 이상의 배열을 병합
- array_walk() - 배열의 각 원소에 대해서 특정 함수를 적용
- array_values() - 배열의 모든 값을 반환
add a note
User Contributed Notesarray_combine
xavier at api-meal dot eu
23-Sep-2009 10:37
23-Sep-2009 10:37
quecoder at gmail
26-Aug-2008 07:00
26-Aug-2008 07:00
<?php
// If they are not of same size, here is solution:
$abbreviations = array("AL", "AK", "AZ", "AR", "TX", "CA");
$states = array("Alabama", "Alaska", "Arizona", "Arkansas");
function combine_arr($a, $b)
{
$acount = count($a);
$bcount = count($b);
$size = ($acount > $bcount) ? $bcount : $acount;
$a = array_slice($a, 0, $size);
$b = array_slice($b, 0, $size);
return array_combine($a, $b);
}
$combined = combine_arr($abbreviations, $states);
print_r($combined);
// Output
// Array ( [AL] => Alabama [AK] => Alaska [AZ] => Arizona
// [AR] => Arkansas )
?>
J.D.D.
09-Aug-2008 08:31
09-Aug-2008 08:31
This may be obvious, but I don't see anything about it on the manual page, so a friendly warning... The array you are using as keys must have all unique values. If not, array elements get dropped.
<?php
$arr_notUnique = array('one' , 'one' , 'two');
$arr_b = array('red' , 'green' , 'blue');
$arr_combo = array_combine($arr_notUnique, $arr_b);
?>
Results: Array ( [one] => green [two] => blue )
NOT: Array ( [one] => red [one] => green [two] => blue )
Zoran
02-Apr-2008 12:57
02-Apr-2008 12:57
Also, Khalys function only works if keys of both arrays are the same because array_combine ignores keys. An easy way to ignore them is by taking array_values(). Floats can be casted to strings to avoid overwriting.
So, the PHP4 function could look something like this:
<?php
function array_combine($arr1, $arr2) {
$out = array();
$arr1 = array_values($arr1);
$arr2 = array_values($arr2);
foreach($arr1 as $key1 => $value1) {
$out[(string)$value1] = $arr2[$key1];
}
return $out;
}
?>
Mike Jean
19-Mar-2008 05:59
19-Mar-2008 05:59
Khaly's PHP4 code below does not work correctly in all cases. Consider when your array consists of floats:
<?php
$okay = array(0, 10, 20, 30);
$not_okay = array(0, 0.5, 1, 1.5);
$foo = array_combine($okay, $okay);
$bar = array_combine($not_okay, $not_okay);
/*
Results:
$foo = {
[0]=> int(0)
[10]=> int(10)
[20]=> int(20)
[30]=> int(30)
}
$bar = {
[0]=> float(0.5)
[1]=> float(1.5)
}
*/
?>
What can you do? In my case, I was just zipping up some select-box options, so I converted everything in my floats to strings.
Khaly
04-Oct-2007 09:11
04-Oct-2007 09:11
This is the function for PHP4 :
<?php
function array_combine($arr1,$arr2) {
$out = array();
foreach($arr1 as $key1 => $value1) {
$out[$value1] = $arr2[$key1];
}
return $out
}
?>
neoyahuu at yahoo dot com
20-Mar-2007 04:36
20-Mar-2007 04:36
Some tips for merging same values in an array
<?php
$array1 = array(1,2,3,4,5,6,7,8,9,10,11,12);
$array2 = array(1,2,3,13);
$merged = array_merge($array1,$array2);
// output normal array_merge
echo '<pre>After array_merge :
';
print_r($merged);
echo '</pre>';
// do double flip for merging values in an array
$merged = array_flip($merged);
$merged = array_flip($merged);
// Output after
echo '<pre>After Double Flip :
';
print_r($merged);
echo '</pre>';
?>
Output ::
After array_merge :
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
[6] => 7
[7] => 8
[8] => 9
[9] => 10
[10] => 11
[11] => 12
[12] => 1
[13] => 2
[14] => 3
[15] => 13
)
After Double Flip :
Array
(
[12] => 1
[13] => 2
[14] => 3
[3] => 4
[4] => 5
[5] => 6
[6] => 7
[7] => 8
[8] => 9
[9] => 10
[10] => 11
[11] => 12
[15] => 13
)
ifeghali at interveritas dot net
26-Feb-2005 06:53
26-Feb-2005 06:53
Use that code to group an array by its first element.
<?
function groupbyfirst($array)
{
foreach ($array as $row)
{
$firstkey = array_keys($row);
$firstkey = $firstkey[0];
$key = $row[$firstkey];
unset($row[$firstkey]);
$newarray[$key][] = $row;
}
return $newarray;
}
?>
Example:
<?
$array =
Array(
0 => Array('color' => 'red','name' => 'apple', 'quantity' => '3'),
1 => Array('color' => 'green','name' => 'pear', 'quantity' => '2'),
2 => Array('color' => 'yellow','name' => 'corn', 'quantity' => '3'),
3 => Array('color' => 'blue','name' => 'grape', 'quantity' => '4'),
4 => Array('color' => 'yellow','name' => 'banana', 'quantity' => '13'),
);
$output = groupbyfirst($array);
print_r($output);
?>
will return:
Array
(
[red] => Array ( [0] => Array ( [name] => apple [quantity] => 3 ) )
[green] => Array ( [0] => Array ( [name] => pear [quantity] => 2 ) )
[yellow] => Array ( [0] => Array ( [name] => corn [quantity] => 3 ), [1] => Array ( [name] => banana [quantity] => 13 ) )
[blue] => Array ( [0] => Array ( [name] => grape [quantity] => 4 ))
)
Or you can use mysql recordset:
<?
while ($row=mysql_fetch_array($result,MYSQL_ASSOC))
{
$firstkey = array_keys($row);
$firstkey = $firstkey[0];
$key = $row[$firstkey];
unset($row[$firstkey]);
$newarray[$key][] = $row;
}
?>
aidan at php dot net
21-May-2004 02:15
21-May-2004 02:15
This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat